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Encyclopedia :: encyclopedia : Oxidation (Site not responding. Last check: 2007-10-11) |
 | | The oxidation state or oxidation number is defined as the sum of negative and positive charges in an atom, which indirectly indicates the number of electrons it has accepted or donated. |
 | | Oxidation numbers are denoted in chemical names by bracketed Roman numerals placed immediately after the relevant element. |
 | | Oxygen has an oxidation number of -2 in compounds, except (i) in the presence of fluorine, in which fluorine's oxidation number takes precedence; (ii) in oxygen-oxygen bonds, including peroxide and superoxide, where one oxygen must neutralize the other's charge. |
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